<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../js/react.development.js"></script>
    <script src="../js/react-dom.development.js"></script>
    <script src="../js/babel.min.js"></script>
  </head>
  <body>
    <div id="test"></div>

    <script type="text/babel">
      class Weather extends React.Component {
        state = {
          isHot: true,
        };

        changeWeather() {
          const { isHot } = this.state;
          this.setState({ isHot: !isHot });
        }

        render() {
          return (
            <div>
              <h2 onClick={() => this.changeWeather()}>
                今天天气真{this.state.isHot ? "炎热" : "寒冷"}
              </h2>
            </div>
          );
        }
      }

      ReactDOM.render(<Weather />, document.getElementById("test"));
    </script>
  </body>
</html>
